public static HeadTable Read(FontStreamReader reader, OffsetTable.Entry entry)
{
reader.Seek(entry);
var version = reader.ReadFixed();
var fontRevision = reader.ReadFixed();
//TODO
var checkSumAdjustment = reader.ReadUInt32();
var magicNumber = reader.ReadUInt32(); // 0x5F0F3CF5
if (magicNumber != 0x5F0F3CF5)
{
throw new FormatException($"Invalid magic number in header: 0x{magicNumber:X}, expecting 0x5F0F3CF5");
}
var flags = reader.ReadUInt16(); // bitflags
var unitsPerEm = reader.ReadUInt16(); // 64-16384
if (unitsPerEm < 64 || unitsPerEm > 16384)
{
throw new FormatException($"Invalid units per em in header: {unitsPerEm:X}, expecting a value between 64 and 16384");
}
var created = reader.ReadLongDateTime();
var modified = reader.ReadLongDateTime();
var xMin = reader.ReadFWord();
var yMin = reader.ReadFWord();
var xMax = reader.ReadFWord();
var yMax = reader.ReadFWord();
var macStyle = (MacStyle)reader.ReadUInt16(); // bitflags
var lowestRecPPEM = reader.ReadUInt16();
var fontDirectionHint = reader.ReadUInt16();
var indexToLocFormat = (IndexToLocFormat)reader.ReadUInt16(); // 0 = short, 1 = long
var glyphDataFormat = (GlyphDataFormat)reader.ReadUInt16(); // 0 = current
return(new HeadTable(version, fontRevision, flags, unitsPerEm, created, modified, xMin, yMin, xMax, yMax, macStyle, lowestRecPPEM, fontDirectionHint, indexToLocFormat, glyphDataFormat));
}